Complex grid-connected system suitable for interconnection of multiple source storage load units and control method

Abstract

The invention discloses a complex grid-connected system suitable for interconnection of a plurality of source storage load units and a control method. The system comprises a plurality of source storage load units, a plurality of grid-connected controllers and a common bus; each source storage load unit adopts a three-domain control architecture; each source storage load unit and the corresponding grid-connected controller form a source storage load unit micro-grid system; the source storage load unit micro-grid systems are mutually independent and perform energy interaction through the common bus. The method comprises the following steps of: firstly, dividing five control domains through bus voltage error amplification signals MEA generated in the source storage load units; and then determining the working modes of the source storage load units and the grid-connected controllers according to each control domain. According to the complex grid-connected system suitable for interconnection of the multiple source storage load units and the control method of the invention, expansion is carried out based on the three-domain control architecture; the system andcontrol method can be well compatible with an existing space power supply controller PCU;and plug and play can be realized; interconnection and grid connection of the plurality of source storage load units are realized only through the common bus and the grid connection controllers, and extra communication lines or control lines do not need to be erected.

Description

technical field [0001] The present invention relates to a control strategy for simple and reliable interconnection of multiple direct current microgrid systems, in particular to a control method for interconnection and grid connection of multi-source storage load units (Source Storage Load Units) based on five-domain control. Background technique [0002] The space power system is a complex source-storage system including photovoltaic arrays, energy storage and loads. Sequential Switching Shunt Regulator (S3R), as one of the bus voltage regulation methods of the space power controller, has a modular design, With the advantages of good dynamic response and strong stability, it is the main architecture of space power controllers at home and abroad. However, with the development of the aerospace industry, a single spacecraft can no longer meet the needs of extraterrestrial exploration, and it is necessary to combine multiple space power supplies to form a space power supply sys...

AI Technical Summary

Problems solved by technology

[0003]At present, the existing technical architecture can be divided into three types. The first is the multi-power channel grid connection adopted by the International Space Station. Its structure is relatively simple, but due to the use of electronic The switch is directly connected, and multiple power channels cannot work at the same time; the second is the constant-voltage grid-connected method used during the rendezvous and docking of China's manned spaceship Shenzhou series and Tiangong-1. This method is only applicable to single-point grid-connected, and Energy interaction between multiple source-storage units cannot be realized; the third type is grid-connected based on a common bus, but the current architecture requires additional communication or control lines, which is detrimental to system reliability and economy, and does not Has good scalability

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